Lately, just an inch or so, but last May 2006, wow.
My 2nd and I would be making out and I'd jack off since we weren't having sex, or she'd work me by hand. "Out of control fire hose" is what she called it. Semen on the pillow, in my hair, on the wall. Sheez. I don't know why it didn't last, but that and the one time I lost weight were the best in my life. Projectile ejaculation is almost as good as male multiple orgasm.
Male orgasm happens in phases. The prostate and seminal vesicles dump into the urethra in one phase, and the urethra contrats in another. When they dump, it feels like the poin of no return; your're loaded. When the contractions start, you shoot.
So the OP said what makes for good spurts. I am sure hydration, nutrition, and exercise help; you must be in good health to make semem. But losing weight, for me, seemed to be key.
This is a great group; I have never seen such a sex-positive group and it's obviously not all about hookups here, like so many bummer social netorking sites. Great stuff. People really lay it out on the line around here. I may renew.